WO2002018803A1 - Shearable fastener - Google Patents
Shearable fastener Download PDFInfo
- Publication number
- WO2002018803A1 WO2002018803A1 PCT/GB2001/003738 GB0103738W WO0218803A1 WO 2002018803 A1 WO2002018803 A1 WO 2002018803A1 GB 0103738 W GB0103738 W GB 0103738W WO 0218803 A1 WO0218803 A1 WO 0218803A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fastener
- shearable
- operative
- restraining component
- shearing
- Prior art date
Links
- 230000000452 restraining effect Effects 0.000 claims abstract description 31
- 238000010008 shearing Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 12
- 230000003313 weakening effect Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 2
- 230000006378 damage Effects 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/36—Conductive members located under tip of screw
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/307—Clamped connections, spring connections utilising a screw or nut clamping member characterised by the thread of the screw or nut
Definitions
- This invention relates to a shearable fastener, and in particular to shearable bolts of utility in electrical connectors.
- Such a connector commonly comprises a socket into which an end of the cable is inserted.
- the wall of the socket contains one or more threaded bores in which threaded bolts are received. Rotation of the bolt brings it into engagement with the cable, thereby clamping the cable to the opposite wall of the socket.
- a potential problem with the use of shearable fasteners is that when the predetermined applied torque is reached the fastener yields suddenly. This results in the user's arm moving in an uncontrolled and sudden manner, with a risk of damage to the muscles or other tissues of the upper arm, and/or a risk of impact of the lower arm or hand with surrounding obstructions. These dangers may be particularly acute where, as is often the case, the electrical connector is fitted in a confined space such as an excavated pit in a pavement or roadway or an underground chamber.
- a shearable fastener comprising an operative part capable of clamping engagement with an object to be fastened and a shearable part adapted to shear from the operative part upon the application of a predetermined torque, wherein the operative part and the shearable part are joined by a restraining component effective to retard movement of the shearable part when the shearable part shears from the operative part.
- the fastener according to the invention is advantageous primarily in that by retarding the motion of the shearable part when it shears from the operative part of the fastener, the restraining component reduces the risk of injury to the user of the fastener.
- the operative part of the fastener is most commonly an externally-threaded shank, and the shearable part is a head configured for engagement with a suitable drive tool such as a socket wrench.
- the fastener thus most commonly has the form of a bolt.
- the head may have any suitable form, a square or hexagonal external shape being most preferred, though any non-circular form may be utilised for engagement of a drive tool with the exterior of the head.
- the head part of the fastener may be provided with an axial bore of non-circular (eg square or hexagonal) cross-section such that a drive tool such as an Allen key may be inserted into the bore to apply the necessary torque to the head part.
- the shearable part is generally joined to the operative part at a shear plane defined by a local weakening in the fastener.
- a weakening most commonly takes the form of a narrowed neck or similar formation.
- the restraining component may extend internally of the fastener, eg in a bore (which may be circular or shaped in section) extending from the shearable part into the operative part, or may be located externally of the fastener, eg as a collar or the like surrounding the point at which the shearable part shears, in use, from the operative part.
- the engagement of the restraining component with both shearable part and operative part is preferably sufficient to inhibit movement of the shearable part away from the operative part when shearing takes place.
- This engagement may simply be a frictional engagement, eg where the restraining component fits closely in a bore extending between the shearable part and the operative part, provided that the engagement of the restraining component with both shearable part and operative part is sufficient to inhibit movement of the shearable part away from the operative part when shearing takes place.
- the restraining component may be bonded to one or both of the shearable part and the operative part, eg by means of adhesive.
- the restraining component is preferably of a material which is capable of considerable angular deformation without shearing. This is in contrast to the shearable and operative parts of the fastener which will generally be formed integrally in a material (most commonly metal such as brass or aluminium) which yields without substantial angular deformation. In other applications (eg where electrical conductivity is not required), relatively brittle plastics material may be used for the shearable and operative parts of the fastener.
- Suitable materials for the restraining component include suitable plastics and elastomeric materials such as rubbers, as well as metals such as mild steel and annealed aluminium. Such materials as are capable of twisting without shearing may be particularly suitable, the torsion of the motion-damping component retarding the angular acceleration of the shearable part immediately after shearing has occurred.
- a shearable fastener comprising an operative part capable of clamping engagement with an object to be fastened and a shearable part adapted to shear from the operative part upon the application of a predetermined torque, the operative part and the shearable part being formed integrally and connected so as to shear with relatively low angular deformation, wherein the operative part and the shearable part are joined by a restraining component capable of relatively high angular deformation without shearing, said restraining component being effective to retard movement of the shearable part when the shearable part shears from the operative part.
- the extent of angular deformation between the operative part and the shearable part of the fastener prior to shearing may be very low, eg less than 10°.
- the restraining component may be capable of twisting through a much greater angle, eg of the order of 10-20° or even more.
- the restraining component may itself shear, or it may retain its integrity. In either case, however, shearing of the fastener takes place in a more controlled and smoother movement, as compared with the prior art, reducing the risk of injury to the user, as described above.
- Figure 1 is a side view in section of a first embodiment of a shearable bolt according to the invention
- Figure 2 is a plan view of the head part of the bolt of Figure 1 ;
- Figure 3 is a view similar to Figure 1 of a second embodiment of a shearable bolt according to the invention.
- Figure 4 is a view similar to Figure 1 of a third embodiment of a shearable bolt according to the invention.
- Figure 5 is a plan view of the head part of the bolt of Figure 4.
- Figure 6 is a view similar to Figure 1 of a fourth embodiment of a shearable bolt according to the invention.
- FIG 7 is a sectional view on the line VII-VII in Figure 6.
- a first embodiment of a shearable bolt according to the invention is generally designated 10.
- the bolt 10 comprises an externally threaded shank 11 which is connected by a narrowed neck 12 to a head part 13.
- the head part 13 is of hexagonal form.
- the bolt 10 is used in conventional fashion.
- the shank 11 is engaged in a threaded bore in an electrical connector (not shown).
- Rotation of the bolt 10 brings its tip into clamping engagement with an electrical cable introduced into the connector.
- Continued rotation of the bolt 10 eg by means of a suitable socket wrench or other tool applied to the hexagonal head part 13
- increases the clamping force until a predetermined torque is reached.
- the bolt 10 shears at the neck 12, releasing the head part 13 from the shank 11.
- the bolt 10 is identical to a conventional shearable bolt. Where the bolt 10 differs from a conventional bolt is in the provision of a central blind bore 14 that extends through the head part 13, past the neck 12 and a short distance into the threaded shank 11.
- the bore 14 is of hexagonal cross-section and is filled with a plug 15 of tough, elastomeric or soft metallic material.
- the plug 15 is capable of considerable angular deformation under twisting or torsion.
- the neck 12 yields quite suddenly, but torsion of the plug 15 retards the consequential acceleration of the head part 13 and constrains its movement.
- the plug 15 thus acts as a restraining component. This leads to a considerably reduced risk of injury to the user.
- the head part 13 and the plug 15 can simply be pulled away from the shank 11.
- FIG. 3 differs from that of Figures 1 and 2 in that, instead of shearing at a neck between the threaded shank 31 and the head part 32, the bolt 30 shears at any one of several shear planes defined by four circumferential slits 33 which are axially spaced along the shank 31.
- the slits 33 define a series of shear planes, the torque necessary to cause the shank 31 to shear at each plane increasing from the plane nearest the tip of the shank 31 to that nearest the head part 32 of the bolt 30.
- the shank 31 shears preferentially at the shear plane in the exposed part of the shank 31 that is closest to the external surface of the connector in which the bolt 30 is engaged (as described in British Patent No 2299640, the teaching of which is incorporated herein by reference).
- an axial bore 34 of hexagonal section is formed in the bolt 30 and this is filled with a plug 35 of elastomeric or soft metallic material which exerts a braking effect on the sheared part of the bolt 30 when the applied torque exceeds that at which shearing takes place.
- the plug 35 must extend from the head part 32 to a point beyond the shear plane furthest from the head part 32.
- the bore 34 extends right through the bolt 30, from the head part 32 to the tip of the shank 31.
- the plug 35 counteracts the acceleration of the sheared part of the bolt 30 (ie the head part 31 and the part of the shank 32 that extends as far as the shear plane), and reduces the movement of that sheared part. After shearing the plug 35 can be withdrawn from the bore 34 in the shank 31.
- a third embodiment of a bolt according to the invention is generally designated 40.
- This bolt 40 is broadly similar to the bolt 10 of Figures 1 and 2. The difference lies in the form of the plug 45 which links the threaded shank 41 and the head part 42.
- the part of the plug 45 which extends through the neck 43 between the head part 42 and the shank 41 is of reduced diameter so that in the region at which shearing takes place the plug 45 is spaced from the internal wall of the bore 44. This reduces any tendency of the plug 45 to inhibit shearing, whilst still permitting the plug 45 to exert its restraining action on movement of the sheared head part 42. It also allows a wider choice of materials for the restraining component since its resilience can be tailored by adjusting its geometry.
- the plug 45 is formed with a hexagonal lip 46 around its upper periphery, this lip 46 being received within a correspondingly shaped recess formed in the upper surface of the head part 42.
- the provision of the lip 46 facilitates removal of the plug 45 from the bore 44 after the head part 42 has been sheared off, in that pulling the head part 42 away from the shank 41 necessarily causes the plug 45 to be withdrawn from the bore 44.
- Such a lip may be unnecessary if the plug 45 is itself designed to shear, or if suitable arrangements are made (eg roughening or knurling of the mating surfaces) to ensure tighter frictional fit of the plug in the head 42 than in the shank 41.
- a threaded shank 61 is once again linked to a head part 62 by a narrowed neck 63.
- the neck is arranged to shear when a certain predetermined torque is applied to it.
- the restraining component is a collar 64 that surrounds the point at which the neck 63 shears, rather than extending through a bore within the bolt 60.
- the collar 64 is of hexagonal cross-section and locates in correspondingly shaped recesses in the juxtaposed upper surface of the shank 61 and under surface of the head part 62.
- the collar 64 is most conveniently moulded around the neck 63, its engagement with the head part 62 and shank 61 being sufficiently close to limit movement of the head part 62 when the head part 62 shears off.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Crushing And Pulverization Processes (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001279969A AU2001279969A1 (en) | 2000-08-31 | 2001-08-17 | Shearable fastener |
DE60107712T DE60107712T2 (de) | 2000-08-31 | 2001-08-17 | Abreissbefestigungselement |
EP01958245A EP1334281B1 (de) | 2000-08-31 | 2001-08-17 | Abreissbefestigungselement |
AT01958245T ATE284492T1 (de) | 2000-08-31 | 2001-08-17 | Abreissbefestigungselement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0021277.9A GB0021277D0 (en) | 2000-08-31 | 2000-08-31 | Shearable fastener |
GB021277.9 | 2000-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002018803A1 true WO2002018803A1 (en) | 2002-03-07 |
Family
ID=9898517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2001/003738 WO2002018803A1 (en) | 2000-08-31 | 2001-08-17 | Shearable fastener |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1334281B1 (de) |
AT (1) | ATE284492T1 (de) |
AU (1) | AU2001279969A1 (de) |
DE (1) | DE60107712T2 (de) |
GB (1) | GB0021277D0 (de) |
WO (1) | WO2002018803A1 (de) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10234460B3 (de) * | 2002-06-27 | 2004-03-18 | Arcus Elektrotechnik Alois Schiffmann Gmbh | Mehrfach-Abscherschraube |
WO2005028774A2 (en) * | 2003-09-24 | 2005-03-31 | Infinity Systems Ag | An electrically conducting element for use in providing power to/from a building element |
DE102004039811A1 (de) * | 2004-08-11 | 2006-02-23 | Pfisterer Kontaktsysteme Gmbh & Co. Kg | Befestigungsmittel, insbesondere Abreißschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels |
EP1953397A1 (de) * | 2007-01-26 | 2008-08-06 | Arcus Elektrotechnik Alois Schiffmann GmbH | Abscherschraube und Verfahren zu ihrer Herstellung |
EP2159881A1 (de) * | 2008-08-25 | 2010-03-03 | Cellpack Gmbh | Abreißschraube für Verbindungselemente von elektrischen Leitern |
EP2322816A1 (de) * | 2009-11-17 | 2011-05-18 | Nexans | Klemmschraube |
CN104265747A (zh) * | 2014-09-15 | 2015-01-07 | 贵州航天精工制造有限公司 | 一种额定预紧力轻型螺栓连接件及其加工方法 |
US9147967B2 (en) | 2012-09-11 | 2015-09-29 | Tyco Electronics Canada Ulc | Electrical connectors and methods for using same |
CN105041816A (zh) * | 2015-04-30 | 2015-11-11 | 贵州航天精工制造有限公司 | 一种额定预紧力轻型螺栓的制作方法及结构 |
FR3063530A1 (fr) * | 2017-03-03 | 2018-09-07 | Seifel | Vis auto-cassante |
US11193522B2 (en) | 2016-11-30 | 2021-12-07 | 3M Innovative Properties Company | Shear bolt |
US11276946B2 (en) | 2019-03-21 | 2022-03-15 | TE Connectivity Services Gmbh | Cable connector system and a method of connecting electrical cables |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020112157A1 (de) * | 2020-05-06 | 2021-11-11 | Voith Patent Gmbh | Formschlüssige Bauteilverbindung und Energieverzehrvorrichtung einer Schienenfahrzeugkupplung mit einer solchen Bauteilverbindung |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2029539A (en) * | 1978-07-11 | 1980-03-19 | Telemecanique Electrique | Insulated shearable nut |
GB2295871A (en) * | 1994-03-15 | 1996-06-12 | Sicame Electrical Dev Ltd | Screw shank for clamping |
GB2299640A (en) | 1995-04-07 | 1996-10-09 | B & H Ltd | Shearable fastener |
WO1997013982A1 (en) * | 1995-10-10 | 1997-04-17 | Ramset Fasteners (Aust.) Pty. Limited | Setting device for a threaded fastener |
-
2000
- 2000-08-31 GB GBGB0021277.9A patent/GB0021277D0/en not_active Ceased
-
2001
- 2001-08-17 DE DE60107712T patent/DE60107712T2/de not_active Expired - Lifetime
- 2001-08-17 WO PCT/GB2001/003738 patent/WO2002018803A1/en active IP Right Grant
- 2001-08-17 AT AT01958245T patent/ATE284492T1/de not_active IP Right Cessation
- 2001-08-17 EP EP01958245A patent/EP1334281B1/de not_active Expired - Lifetime
- 2001-08-17 AU AU2001279969A patent/AU2001279969A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2029539A (en) * | 1978-07-11 | 1980-03-19 | Telemecanique Electrique | Insulated shearable nut |
GB2295871A (en) * | 1994-03-15 | 1996-06-12 | Sicame Electrical Dev Ltd | Screw shank for clamping |
GB2299640A (en) | 1995-04-07 | 1996-10-09 | B & H Ltd | Shearable fastener |
WO1997013982A1 (en) * | 1995-10-10 | 1997-04-17 | Ramset Fasteners (Aust.) Pty. Limited | Setting device for a threaded fastener |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10234460B3 (de) * | 2002-06-27 | 2004-03-18 | Arcus Elektrotechnik Alois Schiffmann Gmbh | Mehrfach-Abscherschraube |
WO2005028774A2 (en) * | 2003-09-24 | 2005-03-31 | Infinity Systems Ag | An electrically conducting element for use in providing power to/from a building element |
WO2005028774A3 (en) * | 2003-09-24 | 2005-04-28 | Infinity Systems Ag | An electrically conducting element for use in providing power to/from a building element |
DE102004039811A1 (de) * | 2004-08-11 | 2006-02-23 | Pfisterer Kontaktsysteme Gmbh & Co. Kg | Befestigungsmittel, insbesondere Abreißschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels |
EP1953397A1 (de) * | 2007-01-26 | 2008-08-06 | Arcus Elektrotechnik Alois Schiffmann GmbH | Abscherschraube und Verfahren zu ihrer Herstellung |
EP2159881A1 (de) * | 2008-08-25 | 2010-03-03 | Cellpack Gmbh | Abreißschraube für Verbindungselemente von elektrischen Leitern |
EP2322816A1 (de) * | 2009-11-17 | 2011-05-18 | Nexans | Klemmschraube |
US9147967B2 (en) | 2012-09-11 | 2015-09-29 | Tyco Electronics Canada Ulc | Electrical connectors and methods for using same |
CN104265747A (zh) * | 2014-09-15 | 2015-01-07 | 贵州航天精工制造有限公司 | 一种额定预紧力轻型螺栓连接件及其加工方法 |
CN105041816A (zh) * | 2015-04-30 | 2015-11-11 | 贵州航天精工制造有限公司 | 一种额定预紧力轻型螺栓的制作方法及结构 |
US11193522B2 (en) | 2016-11-30 | 2021-12-07 | 3M Innovative Properties Company | Shear bolt |
FR3063530A1 (fr) * | 2017-03-03 | 2018-09-07 | Seifel | Vis auto-cassante |
US11276946B2 (en) | 2019-03-21 | 2022-03-15 | TE Connectivity Services Gmbh | Cable connector system and a method of connecting electrical cables |
Also Published As
Publication number | Publication date |
---|---|
DE60107712T2 (de) | 2005-12-22 |
GB0021277D0 (en) | 2000-10-18 |
EP1334281B1 (de) | 2004-12-08 |
AU2001279969A1 (en) | 2002-03-13 |
DE60107712D1 (de) | 2005-01-13 |
EP1334281A1 (de) | 2003-08-13 |
ATE284492T1 (de) | 2004-12-15 |
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